Halo formation in arc-melted Cr-Nb alloys

K. W. Li; S. M. Li; Y. L. Xue; H. Z. Fu

doi:10.1016/j.jcrysgro.2012.07.042

Halo formation in arc-melted Cr-Nb alloys

K. W. Li, S. M. Li, Y. L. Xue, H. Z. Fu

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Haloes of Laves phase Cr ₂Nb around the primary dendrites Cr were observed in the arc-melted Cr-12% Nb hypoeutectic alloy, while no halo of non-faceted Cr phase around the Cr ₂Nb Laves phase occurred in the Cr-20% Nb hypereutectic alloy. This observation differs from the haloes formed in metal-intermetallic alloy systems. An explanation on the formation of Cr ₂Nb halo was presented by considering the solidification behavior of the leading phase and non-reciprocal nucleation characteristics of the Cr ₂Nb/Cr eutectic. In the Cr-12% Nb alloy, primary dendrites Cr worked as a good nucleant available for the occurrence of the halo Cr ₂Nb that subsequently solidified as the leading phase in the eutectic. For the Cr-20% Nb alloy, primary dendrites Cr ₂Nb first precipitated as the leading phase inducing the eutectic formation, resulting in no halo growth. In addition, the coupled zone of the Cr-Nb alloy was theoretically predicted in agreement with the experimental results.

Original language	English
Pages (from-to)	30-34
Number of pages	5
Journal	Journal of Crystal Growth
Volume	357
Issue number	1
DOIs	https://doi.org/10.1016/j.jcrysgro.2012.07.042
State	Published - 15 Oct 2012

Keywords

A1. Halo
A1. Leading phase
A1. Microstructure
B1. Laves phase

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10.1016/j.jcrysgro.2012.07.042

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title = "Halo formation in arc-melted Cr-Nb alloys",

abstract = "Haloes of Laves phase Cr 2Nb around the primary dendrites Cr were observed in the arc-melted Cr-12% Nb hypoeutectic alloy, while no halo of non-faceted Cr phase around the Cr 2Nb Laves phase occurred in the Cr-20% Nb hypereutectic alloy. This observation differs from the haloes formed in metal-intermetallic alloy systems. An explanation on the formation of Cr 2Nb halo was presented by considering the solidification behavior of the leading phase and non-reciprocal nucleation characteristics of the Cr 2Nb/Cr eutectic. In the Cr-12% Nb alloy, primary dendrites Cr worked as a good nucleant available for the occurrence of the halo Cr 2Nb that subsequently solidified as the leading phase in the eutectic. For the Cr-20% Nb alloy, primary dendrites Cr 2Nb first precipitated as the leading phase inducing the eutectic formation, resulting in no halo growth. In addition, the coupled zone of the Cr-Nb alloy was theoretically predicted in agreement with the experimental results.",

keywords = "A1. Halo, A1. Leading phase, A1. Microstructure, B1. Laves phase",

author = "Li, {K. W.} and Li, {S. M.} and Xue, {Y. L.} and Fu, {H. Z.}",

year = "2012",

month = oct,

day = "15",

doi = "10.1016/j.jcrysgro.2012.07.042",

language = "英语",

volume = "357",

pages = "30--34",

journal = "Journal of Crystal Growth",

issn = "0022-0248",

publisher = "Elsevier B.V.",

number = "1",

}

TY - JOUR

T1 - Halo formation in arc-melted Cr-Nb alloys

AU - Li, K. W.

AU - Li, S. M.

AU - Xue, Y. L.

AU - Fu, H. Z.

PY - 2012/10/15

Y1 - 2012/10/15

N2 - Haloes of Laves phase Cr 2Nb around the primary dendrites Cr were observed in the arc-melted Cr-12% Nb hypoeutectic alloy, while no halo of non-faceted Cr phase around the Cr 2Nb Laves phase occurred in the Cr-20% Nb hypereutectic alloy. This observation differs from the haloes formed in metal-intermetallic alloy systems. An explanation on the formation of Cr 2Nb halo was presented by considering the solidification behavior of the leading phase and non-reciprocal nucleation characteristics of the Cr 2Nb/Cr eutectic. In the Cr-12% Nb alloy, primary dendrites Cr worked as a good nucleant available for the occurrence of the halo Cr 2Nb that subsequently solidified as the leading phase in the eutectic. For the Cr-20% Nb alloy, primary dendrites Cr 2Nb first precipitated as the leading phase inducing the eutectic formation, resulting in no halo growth. In addition, the coupled zone of the Cr-Nb alloy was theoretically predicted in agreement with the experimental results.

AB - Haloes of Laves phase Cr 2Nb around the primary dendrites Cr were observed in the arc-melted Cr-12% Nb hypoeutectic alloy, while no halo of non-faceted Cr phase around the Cr 2Nb Laves phase occurred in the Cr-20% Nb hypereutectic alloy. This observation differs from the haloes formed in metal-intermetallic alloy systems. An explanation on the formation of Cr 2Nb halo was presented by considering the solidification behavior of the leading phase and non-reciprocal nucleation characteristics of the Cr 2Nb/Cr eutectic. In the Cr-12% Nb alloy, primary dendrites Cr worked as a good nucleant available for the occurrence of the halo Cr 2Nb that subsequently solidified as the leading phase in the eutectic. For the Cr-20% Nb alloy, primary dendrites Cr 2Nb first precipitated as the leading phase inducing the eutectic formation, resulting in no halo growth. In addition, the coupled zone of the Cr-Nb alloy was theoretically predicted in agreement with the experimental results.

KW - A1. Halo

KW - A1. Leading phase

KW - A1. Microstructure

KW - B1. Laves phase

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U2 - 10.1016/j.jcrysgro.2012.07.042

DO - 10.1016/j.jcrysgro.2012.07.042

M3 - 文章

AN - SCOPUS:84865058124

SN - 0022-0248

VL - 357

SP - 30

EP - 34

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

IS - 1

ER -

Halo formation in arc-melted Cr-Nb alloys

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Keywords

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